Rattles are a problem, although for me not from the camera rattling in the transparent case. I took mine apart and found it was the speaker rattling in its mount. I superglued it in, which fixed it, but it's not good for a consumer product - others have had battery rattles or rattles of unknown origin, which all sound very loud on recorded audio.
I would avoid clamped pivot bar mounts if possible - on surface-dressed roads, they all vibrate to some extent at the pivot point, even when firmly clamped, and make rolling shutter worse. This means making your own though. Again, not exactly consumer-friendly.